Did you know that when you move your eyes from one point to another, it's called a saccade? Chances are, you did.
Well, when you do this, your body actually shuts down your vision for a split second, to prevent you from feeling sick. Try it now. Bet you didn't know that.
Well, that's when they get closer. They're only there during the saccade. They want to steal your soul. It's just a matter of time until they get there.
But hey, don't panic and look around. They'll get here quicker. Besides, saccades are pretty short, and the soul-stealers start off pretty far away. It'll take around eighty years for them to get here.
But when they do get here, God help your soul.